diff options
Diffstat (limited to 'usr.sbin/bsnmpd/modules/snmp_hostres/hostres_network_tbl.c')
-rw-r--r-- | usr.sbin/bsnmpd/modules/snmp_hostres/hostres_network_tbl.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_network_tbl.c b/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_network_tbl.c new file mode 100644 index 0000000..a98241c --- /dev/null +++ b/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_network_tbl.c @@ -0,0 +1,302 @@ +/*- + * Copyright (c) 2005-2006 The FreeBSD Project + * All rights reserved. + * + * Author: Victor Cruceru <soc-victor@freebsd.org> + * + * Redistribution of this software and documentation and use in source and + * binary forms, with or without modification, are permitted provided that + * the following conditions are met: + * + * 1. Redistributions of source code or documentation must retain the above + * copyright notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * Host Resources MIB implementation for SNMPd: instrumentation for + * hrNetworkTable + */ + +#include <sys/types.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sys/sysctl.h> + +#include <net/if.h> +#include <net/if_mib.h> + +#include <assert.h> +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <ifaddrs.h> +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> + +#include "hostres_snmp.h" +#include "hostres_oid.h" +#include "hostres_tree.h" + +#include <bsnmp/snmp_mibII.h> + +/* + * This structure is used to hold a SNMP table entry + * for HOST-RESOURCES-MIB's hrNetworkTable + */ +struct network_entry { + int32_t index; + int32_t ifIndex; + TAILQ_ENTRY(network_entry) link; +#define HR_NETWORK_FOUND 0x001 + uint32_t flags; + +}; +TAILQ_HEAD(network_tbl, network_entry); + +/* the head of the list with hrNetworkTable's entries */ +static struct network_tbl network_tbl = TAILQ_HEAD_INITIALIZER(network_tbl); + +/* last (agent) tick when hrNetworkTable was updated */ +static uint64_t network_tick; + +/* maximum number of ticks between updates of network table */ +uint32_t network_tbl_refresh = HR_NETWORK_TBL_REFRESH * 100; + +/* Constants */ +static const struct asn_oid OIDX_hrDeviceNetwork_c = OIDX_hrDeviceNetwork; + +/** + * Create a new entry into the network table + */ +static struct network_entry * +network_entry_create(const struct device_entry *devEntry) +{ + struct network_entry *entry; + + assert(devEntry != NULL); + if (devEntry == NULL) + return (NULL); + + if ((entry = malloc(sizeof(*entry))) == NULL) { + syslog(LOG_WARNING, "%s: %m", __func__); + return (NULL); + } + + memset(entry, 0, sizeof(*entry)); + entry->index = devEntry->index; + INSERT_OBJECT_INT(entry, &network_tbl); + + return (entry); +} + +/** + * Delete an entry in the network table + */ +static void +network_entry_delete(struct network_entry* entry) +{ + + TAILQ_REMOVE(&network_tbl, entry, link); + free(entry); +} + +/** + * Fetch the interfaces from the mibII module, get their real name from the + * kernel and try to find it in the device table. + */ +static void +network_get_interfaces(void) +{ + struct device_entry *dev; + struct network_entry *net; + struct mibif *ifp; + int name[6]; + size_t len; + char *dname; + + name[0] = CTL_NET; + name[1] = PF_LINK; + name[2] = NETLINK_GENERIC; + name[3] = IFMIB_IFDATA; + name[5] = IFDATA_DRIVERNAME; + + for (ifp = mib_first_if(); ifp != NULL; ifp = mib_next_if(ifp)) { + HRDBG("%s %s", ifp->name, ifp->descr); + + name[4] = ifp->sysindex; + + /* get the original name */ + len = 0; + if (sysctl(name, 6, NULL, &len, 0, 0) < 0) { + syslog(LOG_ERR, "sysctl(net.link.ifdata.%d." + "drivername): %m", ifp->sysindex); + continue; + } + if ((dname = malloc(len)) == NULL) { + syslog(LOG_ERR, "malloc: %m"); + continue; + } + if (sysctl(name, 6, dname, &len, 0, 0) < 0) { + syslog(LOG_ERR, "sysctl(net.link.ifdata.%d." + "drivername): %m", ifp->sysindex); + free(dname); + continue; + } + + HRDBG("got device %s (%s)", ifp->name, dname); + + if ((dev = device_find_by_name(dname)) == NULL) { + HRDBG("%s not in hrDeviceTable", dname); + free(dname); + continue; + } + HRDBG("%s found in hrDeviceTable", dname); + + dev->type = OIDX_hrDeviceNetwork_c; + dev->flags |= HR_DEVICE_IMMUTABLE; + + free(dname); + + /* Then check hrNetworkTable for this device */ + TAILQ_FOREACH(net, &network_tbl, link) + if (net->index == dev->index) + break; + + if (net == NULL && (net = network_entry_create(dev)) == NULL) + continue; + + net->flags |= HR_NETWORK_FOUND; + net->ifIndex = ifp->index; + } + + network_tick = this_tick; +} + +/** + * Finalization routine for hrNetworkTable. + * It destroys the lists and frees any allocated heap memory. + */ +void +fini_network_tbl(void) +{ + struct network_entry *n1; + + while ((n1 = TAILQ_FIRST(&network_tbl)) != NULL) { + TAILQ_REMOVE(&network_tbl, n1, link); + free(n1); + } +} + +/** + * Get the interface list from mibII only at this point to be sure that + * it is there already. + */ +void +start_network_tbl(void) +{ + + mib_refresh_iflist(); + network_get_interfaces(); +} + +/** + * Refresh the table. + */ +static void +refresh_network_tbl(void) +{ + struct network_entry *entry, *entry_tmp; + + if (this_tick - network_tick < network_tbl_refresh) { + HRDBG("no refresh needed"); + return; + } + + /* mark each entry as missing */ + TAILQ_FOREACH(entry, &network_tbl, link) + entry->flags &= ~HR_NETWORK_FOUND; + + network_get_interfaces(); + + /* + * Purge items that disappeared + */ + TAILQ_FOREACH_SAFE(entry, &network_tbl, link, entry_tmp) { + if (!(entry->flags & HR_NETWORK_FOUND)) + network_entry_delete(entry); + } + + HRDBG("refresh DONE"); +} + +/* + * This is the implementation for a generated (by our SNMP tool) + * function prototype, see hostres_tree.h + * It handles the SNMP operations for hrNetworkTable + */ +int +op_hrNetworkTable(struct snmp_context *ctx __unused, struct snmp_value *value, + u_int sub, u_int iidx __unused, enum snmp_op curr_op) +{ + struct network_entry *entry; + + refresh_network_tbl(); + + switch (curr_op) { + + case SNMP_OP_GETNEXT: + if ((entry = NEXT_OBJECT_INT(&network_tbl, + &value->var, sub)) == NULL) + return (SNMP_ERR_NOSUCHNAME); + value->var.len = sub + 1; + value->var.subs[sub] = entry->index; + goto get; + + case SNMP_OP_GET: + if ((entry = FIND_OBJECT_INT(&network_tbl, + &value->var, sub)) == NULL) + return (SNMP_ERR_NOSUCHNAME); + goto get; + + case SNMP_OP_SET: + if ((entry = FIND_OBJECT_INT(&network_tbl, + &value->var, sub)) == NULL) + return (SNMP_ERR_NO_CREATION); + return (SNMP_ERR_NOT_WRITEABLE); + + case SNMP_OP_ROLLBACK: + case SNMP_OP_COMMIT: + abort(); + } + abort(); + + get: + switch (value->var.subs[sub - 1]) { + + case LEAF_hrNetworkIfIndex: + value->v.integer = entry->ifIndex; + return (SNMP_ERR_NOERROR); + + } + abort(); +} |